class_docstr: Latent Variables Class
  
  Holds latent variable objects and contains method for latent variable manipulation. Latent variables are 
  referred to as z as shorthand. This is convention in much of the literature.
code: def get_z_priors(self):
      priors = []
      for z in self.z_list:
          priors.append(z.prior)
      return priors
  
imports: import numpy
  import pandas
  from .covariances import acf
  from .output import TablePrinter
  from .inference import *
  from .families import Normal, t, TruncatedNormal, Cauchy, Skewt, InverseGamma, Flat, InverseWishart, Laplace
label_desc: Use image node_id 7 for calling the LatentVariables obj's underlying member method code with example usage: obj.get_z_priors() and returns: priors